Noah Webster's Dictionary (p. pr. & vb. n.) of Ascertain.

Multi-Version Concordance Ascertaining (2 Occurrences) Mark 15:45 When he found out from the centurion, he granted the body to Joseph. (See NAS) John 7:51 "Does our Law," he asked, "judge a man without first hearing what he has to say and ascertaining what his conduct is?" (WEY)